Problem 42986. Determine the roots of a cubic equation

Solution 1481873

Submitted on 6 Apr 2018 by J. S. Kowontan
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Test Suite

Test Status Code Input and Output
1   Pass
a=1; b=3; c=3; d=1; y_correct = [-1 -1 -1]; assert(sum(abs(cubicRoots(a,b,c,d)-y_correct))<1e-3)

2   Pass
a=1; b=-6; c=11; d=-6; y_correct = [1 2 3]; assert(sum(abs(cubicRoots(a,b,c,d)-y_correct))<1e-3)

3   Pass
a=4; b=4; c=-1; d=-1; y_correct = [-1 -0.5 0.5]; assert(sum(abs(cubicRoots(a,b,c,d)-y_correct))<1e-3)

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